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Meet the shark callers of Mesi, Papua New Guinea. For centuries people there have prasticed shark calling — beckoning sharks close with a special rattle and then yanking them in their outrigger canoes. Those left say that in recent years their catch has depleted, and they wonder whether exploratory work in nearby waters linked to a world-first seabed mining project might be partly to blame. Despite the assurances of scientists and the mining company, they worry also about the long term implications of underwater mining on the seas and fish that have long sustained them.